I began this project 25 years ago. The wife of a friend was nine months pregnant, and I had an idea, based on time-lapse photography, to photograph them with their baby soon after the birth, and then every year, from then on, forever.

I planned the shoots in a formal, almost scientific way. Each year, on the same date, against the same backdrop, under the same lighting, I would photograph the same family. This way there are no distractions, only the miracle of growth and the changes of time and ageing.